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WO2002050369A1 - Composition solide destinee au desencrage du papier de recyclage - Google Patents

Composition solide destinee au desencrage du papier de recyclage Download PDF

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Publication number
WO2002050369A1
WO2002050369A1 PCT/SE2001/002578 SE0102578W WO0250369A1 WO 2002050369 A1 WO2002050369 A1 WO 2002050369A1 SE 0102578 W SE0102578 W SE 0102578W WO 0250369 A1 WO0250369 A1 WO 0250369A1
Authority
WO
WIPO (PCT)
Prior art keywords
composition
fatty acid
inking
solid
recycling paper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/SE2001/002578
Other languages
English (en)
Inventor
German Tello
Arne Andersson
Kenneth HÄGGLUND
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Akzo Nobel NV
Nouryon Pulp and Performance Chemicals AB
Original Assignee
Akzo Nobel NV
Eka Chemicals AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Akzo Nobel NV, Eka Chemicals AB filed Critical Akzo Nobel NV
Priority to AU2002215296A priority Critical patent/AU2002215296A1/en
Publication of WO2002050369A1 publication Critical patent/WO2002050369A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D21C5/02—Working-up waste paper
    • D21C5/025—De-inking
    • D21C5/027—Chemicals therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/64—Paper recycling

Definitions

  • the present invention relates to a composition and a process for de-inking of recycling paper, and a process for preparation of the composition.
  • Recycling paper has become an increasingly important raw material for production of paper, both for economic and environmental reasons.
  • the recycling paper includes printed waste paper, such as newspapers or journals
  • de-inking is normally necessary.
  • a conventional de-inking process includes adding a soap solution or a melted fatty acid to an alkaline aqueous fibre stock suspension from recycling paper, optionally together with other chemicals, and followed by removal of ink particles, for example by flotation.
  • it is important that the soap or fatty acid is rapidly emulsified or dispersed into the fibre stock suspension.
  • CA Patent Application 2147384 discusses certain draw-backs of these methods and discloses a de-inking process comprising treating a slurry of wastepaper with a composition comprising a fatty acid and a non-ionic surfactant.
  • US Patent 4483742 discloses a liquid soap for use in paper re-cycling comprising a fatty acid saponified to about 50%.
  • US Patent 4586982 discloses an improved de-inking process comprising adding a fatty acid or a resinic acid to a suspension of wastepaper fibres in the form of a previously prepared aqueous emulsion or dispersion.
  • the invention concerns a solid composition for de-inking of recycling paper comprising at least one fatty acid that is partially saponified with at least one alkaline substance.
  • the degree of saponification is from about 1 to about
  • the degree of saponification refers to the saponified portion of the total number of saponifiable carboxylic groups in the fatty acid or fatty acid mixture. It is assumed that substantially all of the alkaline substance used participates in the saponification.
  • the total content of partially saponified fatty acids is suitably from about 50 to 100 wt%, preferably from about 70 to 100 wt%, most preferably from about 85 to 100 wt%.
  • the product is suitably in the form of a powder, granules, flakes or the like, preferably with a particle size from about 0.1 mm to about 10 mm, most preferably from about 0.5 mm to about 5 mm.
  • the saponified part of the at least one fatty acid acts as a dispersant, rendering the composition to be self-emulsifying or self-dispersing.
  • the at least one fatty acid is selected from those that in partially saponified state are solid at room temperature (about 20-25°C).
  • Preferred fatty acids have from 8 to 24, preferably 14 to 20 carbon atoms, and preferably have from 0 to 3 double bonds.
  • Examples of such fatty acids are myristic acid, palmitic acid, stearic acid, arachidic acid and behenic acid, and mixtures thereof. Particularly preferred are palmitic, stearic, and arachidic acid, and mixtures thereof. It is in most cases preferred to use mixtures of different fatty acids, which mixtures normally are commercially available.
  • the alkaline substance may be selected from inorganic or organic compounds.
  • Inorganic compounds include, for example, ammonia or hydroxides and carbonates of alkali metals and alkaline earth metals, such as sodium, potassium or calcium, alone or in mixtures.
  • Organic compounds are most preferred and may, for example, include various organic amines, alone or in mixtures.
  • One suitable group of amines have the general formula R T R ⁇ N, where R1-R 3 , independently of each other, can be hydrogen, alkyl groups, aryl groups, hydroxyalkyl groups or other organic substituents, wherein it is preferred that at least one of R R 3 is an organic substituent.
  • Particularly preferred amino compounds include amino alcohols such as ethanol amines and propanol amines.
  • Monoethanol amine (MEA), diethanol amine (DEA) and triethanol amine (TEA), and mixtures thereof, are most preferred.
  • composition may comprise more than 96 wt% or even substantially consist of at least one saponified fatty acid, it can further include additives conventionally used in de-inking like at least one dispersant (in addition to the saponified part of the at least one fatty acid), alkali metal silicate, one or several cellulosic derivatives, one or several complexing agents, one or several oxidative bleaching agents, or inert substances such as one or several fillers.
  • Dispersants may be selected from non-ionic, an-ionic, cat-ionic and amphoteric surfactants, among which non-ionic surfactants are preferred.
  • Suitable non-ionic surfactants include alkoxylated compounds preferably having from 14 to 20 carbon atoms, such as fatty alcohols, acids, alkylphenols, alkylamines, mono- di- and triglycerides, and alkyl polyglycosides or polyhydroxy fatty acid amides, alone or in mixtures.
  • Particularly preferred surfactants are ethoxylated and/or propoxylated compounds, preferably having from 4 to 120 ethylene oxide units and/or from 4 to 40 propylene oxide units.
  • Alkali metal silicate preferably metasilicate, of sodium, potassium or a mixture thereof, may, for example, be present in an amount from 0 up to about 5 wt%, preferably from about 0.5 to about 3 wt%.
  • the alkali metal silicate serves the purpose of chelating heavy metal ions such as copper, chromium, iron, manganese and the like, that catalyses decomposition of peroxides present during the de-inking but also in stabilising loosened printing ink against redepositing on the fibres during the de-inking. Further, alkali metal silicate may also contribute to saponification of the fatty acid in the composition.
  • cellulose derivatives are present, the total content thereof is suitably from 0 up to about 1 wt%, preferably from about 0.1 to about 0.5 wt%.
  • Cellulose derivatives may, for example, be selected from carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, ethyl hydroxyethyl cellulose or mixtures thereof. Cellulose derivatives serve the purpose of preventing small ink particles from redepositing on the fibres during the de-inking.
  • complexing agents may, for example, be selected from EDTA, DTPA, phosphonic acids and salts or other derivatives thereof, or mixtures thereof. Complexing agents serve the purpose of chelating heavy metal ions such as copper, chromium, iron, manganese and the like, that catalyses decomposition of peroxides present during the de-inking.
  • Oxidative bleaching agents may, for example, be selected from solid substances generating peroxides, preferably hydrogen peroxide, in aqueous solutions.
  • Such solid substances include, for example, alkali metal salts of percarbonate, perborate, peroxysulfate, peroxyphosphate or peroxysilicate.
  • fillers are present, the total content thereof is suitably from 0 up to about 10 wt%, preferably from about 1,0 to about 4 wt%.
  • Fillers may, for example, be selected from talc, calcium carbonate, different kinds of clays etc.
  • the composition of the invention may also include any substance that otherwise would be possible to add separately in a de-inking process or substances improving the physical properties of the composition.
  • the invention also concerns a process for preparing a composition as described above comprising a step of mixing at least one fatty acid with at least one alkaline substance and any optional components to be included, preferably at a temperature from about 10 to about 40°C, most preferably from about 15 to about 25°C.
  • the at least one alkaline substance is added in an amount sufficient to obtain a desirable degree of saponification. If the at least one alkaline substance is solid, the components are preferably mixed in a solid state.
  • the fatty acid is preferably added in melted form, whereupon the mixture is cooled to obtain a solid product, to which any optional component can be added.
  • the solid mixture can then be ground and sieved or treated in any other suitable way to obtain a powder, granules, flakes or the like with a desired particle size.
  • the product of the invention can be prepared in a very simple manner.
  • the composition by first making an aqueous dispersion or emulsion of at least one fatty acid and at least one dispersing agent, partially saponifying said at least one fatty acid by adding at least one alkaline substance, before or after the dispersion or emulsion is prepared, and then drying, for example spray drying, the dispersion or emulsion to yield a solid product.
  • the invention further concerns a process for de-inking of recycling paper, using the composition of the invention as described above, suitably in an amount from about 0.01 to about 5 wt%, preferably from about 0.05 to about 1 wt%, most preferably from about 0.1 to about 0.5 wt% based on the recycling paper.
  • the process comprises the steps of preparing an aqueous fatty acid emulsion or dispersion from water and a solid composition of the invention as described above, and adding the obtained emulsion or dispersion to the recycling paper or to the water forming an aqueous fibre stock suspension thereof.
  • the fatty acid emulsion or dispersion can be prepared with moderate mixing energy and at a comparatively low temperature, preferably from about 25 to about 90°C, most preferably from about 30 to about 50°C, but still result in an emulsion or dispersion with excellent physical properties, e.g. small particle size (preferably from about 0.1 to about 10 ⁇ m, most preferably from about 0.5 to about 2.0 ⁇ m) and high liquidity and stability.
  • this dispersion or emulsion it is easy to achieve rapid distribution of the fatty acid in the fibre stock suspension and thereby also good de-inking.
  • the process comprises a step of adding the solid composition of the invention directly to the recycling paper or to the water forming an aqueous fibre stock suspension thereof. It has been found possible to disperse or emulsify the solid composition directly into the fibre stock suspension, and thereby getting away from the extra step of first preparing an emulsion or dispersion of the fatty acid. If the composition is packed in containers of paper, such as bags, sacks or boxes of paper, the entire containers can be added to the recycling paper or the fibre stock suspension, thereby avoiding dusting problems. Furthermore, the paper in the container may include components active in the de-inking process or a following pulping process.
  • the aqueous fibre stock suspension may be prepared by any conventional means from recycling paper such as newspapers, magazines, office waste and the like to a preferred dry content from about 2 to about 30 wt%, most preferably from about 4 to about 20 wt%.
  • recycling paper such as newspapers, magazines, office waste and the like
  • Such conventional de-inking chemicals include one or several dispersants, alkali metal silicate, one or several cellulose derivatives, one or several complexing agents, and one or several oxidative bleaching agents.
  • de-inking chemicals examples are given in the above description of the composition, although they of course also may be added in liquid form, for example as aqueous solutions.
  • the oxidative bleaching agent is preferably added as an aqueous hydrogen peroxide solution.
  • alkaline substances such as alkali metal hydroxide, preferably sodium hydroxide, to obtain a suitable pH of the fibre stock suspension. This pH is preferably from about 7 to about 12, most preferably from about 8 to about 10, under which conditions the added fatty acid or acids become substantially completely saponified and to some extent, together with calcium, magnesium or other polyvalent metal ions, precipitate and form flakes or other kinds of aggregates.
  • the ink particles After a suitable time, preferably from about 2 min to about 100 min, most preferably from about 10 to about 30 min, at a suitable temperature, preferably from about 10 to about 90°C, most preferably from about 30 to about 75°C, and preferably under moderate agitation, most of the ink particles have been detached from the fibres and deposited on the precipitated saponified fatty acid.
  • the ink particles may then be removed by any conventional means, for example by flotation and/or washing, and the remaining de-inked fibre stock suspension be used for making paper.
  • composition of the invention may be added, as a solid material or a dispersion or emulsion thereof, to the recycling paper or to the water before or after the fibre stock suspension is formed and before or after other chemicals are added. Further, it is also possible not to add any oxidative bleaching agent until after the removal of the ink particles.
  • compositions in wt% are specified in Table 1 , which also gives the degree of saponification (DS) in %.
  • compositions No. 1-7 were prepared by grinding the ingredients together in a laboratory mill followed by sieving through a 1 mm screen. The material >1mm was milled again to pass the 1 mm screen.
  • Compositions No. 8 and 9 were prepared by mixing the liquid ingredients with the fatty acid in its molten form. The products were then ground and sieved as compositions No. 1-7.
  • Compositions No. 10 and 11 were prepared by mixing compositions No. 8 and 9, respectively, with the other ingredients, followed by grinding and sieving as described above.
  • Compositions No. 12-15 were prepared by mixing the liquid ingredients with molten fatty acids. The solid materials obtained after cooling were then flaked.
  • Solid compositions were also prepared by spray drying the commercially available fatty acid dispersions EcollectTM 5030 and 5230 (Eka Chemicals AB, Sweden), which both are 30% dispersions in water of mostly saturated fatty acids and surfactants with a pH of 5-9 and a viscosity lower than 300 mPas. -Q r ⁇
  • Example 2 The compositions prepared in Example 1 were used to prepare aqueous dispersions.
  • Compositions No. 1-7, partially saponified with KOH, could be made into 15% dispersions in 75-80°C water, using an Ultra Turrax mixer at 3000 rpm.
  • Compositions No. 8-15, partially saponified with TEA, could be made into 15% dispersions at lower temperature, 35-40°C, with lower stirring energy, using a laboratory mixer at 800 rpm. This yielded dispersions with small particles and liquid dispersion at room temperature.
  • Example 3 In four sets of trials the compositions No. 1-15 and the spray dried dispersions of Example 1 were tested for deinking waste paper in a pulper. The compositions were added in dry (i.e. solid) form and/or as dispersions prepared according to Example 2.
  • the mixture was stirred for 15 minutes and then transferred to a Lamort type laboratory flotation cell and diluted with water of 45°C and 6°dH to 1 % consistency.
  • the flotation was then started and samples were taken out before flotation and after 12 min of flotation.
  • the amount of solid substance lost in the flotation was determined.
  • the pH was measured in the 15% pulp suspension and in the 1% suspension before flotation and after the flotation, and in all the experiments determined to be between about 8.6 to 9.4.
  • the pulp samples from 0 and 12 min of flotation were made into sheets.
  • the Effective Residual Ink Concentration, ERIC was also measured on the sheets from 0 and 12 min flotation time.
  • the principle for the ERIC measurement is to us an infrared radiation of 950 nm to measure the amount of fragmented printing ink in a paper sample.
  • Tables 2-5 The results from each set of trials are summarised in Tables 2-5, showing that using a composition of the invention, either in solid form or as a pre-dispersed fatty acid dispersion, give about the same or even better effect in deinking than the commercial fatty acid dispersion Ecollect 5230 used as a reference.

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  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Toxicology (AREA)
  • Paper (AREA)

Abstract

L'invention concerne une composition solide utilisée dans le désencrage du papier de recyclage et contenant au moins un acide gras partiellement saponifié au moyen d'au moins une substance alcaline. Cette invention se rapporte aussi à des préparations et à leur utilisation.
PCT/SE2001/002578 2000-12-21 2001-11-22 Composition solide destinee au desencrage du papier de recyclage Ceased WO2002050369A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002215296A AU2002215296A1 (en) 2000-12-21 2001-11-22 Solid composition for de-inking of recycling paper

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP00850222.1 2000-12-21
EP00850222 2000-12-21

Publications (1)

Publication Number Publication Date
WO2002050369A1 true WO2002050369A1 (fr) 2002-06-27

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ID=8175692

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2001/002578 Ceased WO2002050369A1 (fr) 2000-12-21 2001-11-22 Composition solide destinee au desencrage du papier de recyclage

Country Status (2)

Country Link
AU (1) AU2002215296A1 (fr)
WO (1) WO2002050369A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4483742A (en) * 1982-06-01 1984-11-20 Scm Corporation Liquid soaps comprising pine oil and soap-making acid for use in paper-recycling
US4959123A (en) * 1987-02-02 1990-09-25 Chemische Fabrik Gruenau Gmbh Process for deinking printed waste paper
US4971656A (en) * 1988-03-31 1990-11-20 Chemische Fabrik Gruenau Gmbh Flotation process for deinking printed waste paper
WO1991014821A1 (fr) * 1990-03-21 1991-10-03 Stephenson Group Limited Recyclage de produits fibreux
US5346543A (en) * 1992-10-15 1994-09-13 Lion Corporation Deinking agent for reclaiming waste paper
US5403440A (en) * 1990-10-09 1995-04-04 Henkel Kommanditgesellschaft Auf Aktien Use of compounds containing polyether chains prepared from epoxidized carboxylic acid derivatives for the removal of printing inks from wastepaper
US5658427A (en) * 1995-08-01 1997-08-19 Geo Specialty Chemicals, Inc. Ethoxylated soya glycerides with glycols as deinking collector modifiers
US5968313A (en) * 1994-11-12 1999-10-19 Morton International, Inc. Process for deinking pulp fibers using ethoxylated lanolin

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4483742A (en) * 1982-06-01 1984-11-20 Scm Corporation Liquid soaps comprising pine oil and soap-making acid for use in paper-recycling
US4959123A (en) * 1987-02-02 1990-09-25 Chemische Fabrik Gruenau Gmbh Process for deinking printed waste paper
US4971656A (en) * 1988-03-31 1990-11-20 Chemische Fabrik Gruenau Gmbh Flotation process for deinking printed waste paper
WO1991014821A1 (fr) * 1990-03-21 1991-10-03 Stephenson Group Limited Recyclage de produits fibreux
US5403440A (en) * 1990-10-09 1995-04-04 Henkel Kommanditgesellschaft Auf Aktien Use of compounds containing polyether chains prepared from epoxidized carboxylic acid derivatives for the removal of printing inks from wastepaper
US5346543A (en) * 1992-10-15 1994-09-13 Lion Corporation Deinking agent for reclaiming waste paper
US5968313A (en) * 1994-11-12 1999-10-19 Morton International, Inc. Process for deinking pulp fibers using ethoxylated lanolin
US5658427A (en) * 1995-08-01 1997-08-19 Geo Specialty Chemicals, Inc. Ethoxylated soya glycerides with glycols as deinking collector modifiers

Also Published As

Publication number Publication date
AU2002215296A1 (en) 2002-07-01

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